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Science fiction author Karl Schroeder has an interesting answer to the Fermi Paradox, which asks why there is no evidence for extraterrestrial life given the high probability for its existence:

Basically, either advanced alien civilizations don't exist, or we can't see them because they are indistinguishable from natural systems. I vote for the latter.

For the interested news reader, the distinction between what's natural and what's artificial is already blurring in the fields of biology and chemistry. It is mind-boggling, though, that the most advanced technology might be undetectable because it appears to us as natural physical phenomena.